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Contents
# frozen_string_literal: true
require_relative 'helper/stacked_mixin'
#
# Here's how to set up a Gruff::StackedArea.
#
# g = Gruff::StackedArea.new
# g.title = 'StackedArea Graph'
# g.data :Jimmy, [25, 36, 86, 39, 25, 31, 79, 88]
# g.data :Charles, [80, 54, 67, 54, 68, 70, 90, 95]
# g.data :Julie, [22, 29, 35, 38, 36, 40, 46, 57]
# g.write('stacked_area.png')
#
class Gruff::StackedArea < Gruff::Base
include StackedMixin
# @deprecated
def last_series_goes_on_bottom=(_value)
warn '#last_series_goes_on_bottom is deprecated. It is no longer effective.'
end
private
def initialize_attributes
super
@minimum_value = 0.0
end
def setup_data
calculate_maximum_by_stack
super
end
def draw_graph
x_increment = (@graph_width / (column_count - 1)).to_f
height = Array.new(column_count, 0)
prev_data_points = nil
store.norm_data.each do |data_row|
next if data_row.points.empty?
data_points = []
data_row.points.each_with_index do |data_point, index|
# Use incremented x and scaled y
new_x = @graph_left + (x_increment * index)
new_y = @graph_top + (@graph_height - (data_point * @graph_height) - height[index])
height[index] += (data_point * @graph_height)
data_points << new_x
data_points << new_y
draw_label(new_x, index)
end
poly_points = data_points.dup
if prev_data_points
((prev_data_points.length / 2) - 1).downto(0) do |i|
poly_points << prev_data_points[2 * i]
poly_points << prev_data_points[(2 * i) + 1]
end
else
poly_points << @graph_right
poly_points << (@graph_bottom - 1)
poly_points << @graph_left
poly_points << (@graph_bottom - 1)
end
poly_points << data_points[0]
poly_points << data_points[1]
Gruff::Renderer::Polygon.new(renderer, color: data_row.color).render(poly_points)
prev_data_points = data_points
end
end
end
Version data entries
14 entries across 14 versions & 1 rubygems